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  • 张禛,吴江.氯化铜改性石墨相氮化碳吸附剂的脱汞性能[J].环境工程学报,2019,13(7):1687-1693.DOI:10.12030/j.cjee.201810141    [点击复制]
  • ZHANG Zhen,WU Jiang.Removal of elemental mercury by cupric chloride-modified graphitic carbon nitride[J].,2019,13(7):1687-1693.DOI:10.12030/j.cjee.201810141   [点击复制]
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氯化铜改性石墨相氮化碳吸附剂的脱汞性能
张禛2,吴江2
0
(1.江苏大学能源与动力工程学院,镇江 212013;2.上海电力大学能源与机械工程学院,上海 200090)
摘要:
针对燃煤电厂汞污染物排放控制的问题,以尿素为前驱体,通过直接热聚合法制得绒毛状石墨相氮化碳(g-C3N4),并用于低温条件下吸附脱除单质汞(Hg0)。利用透射电子显微镜(TEM)、X射线衍射(XRD)、氮气吸附-脱附、X射线光电子能谱(XPS)等手段对吸附剂进行表征。结果表明:未改性g-C3N4具有良好的低温脱汞活性,在120 °C时其脱汞效率可达84.7%;CuCl2改性可以有效提高g-C3N4的脱汞性能,其脱汞效率在40~200 °C范围内均可达到97%以上;温度对吸附剂脱汞效率的影响较小。XPS表征测试结果表明,铜离子和共价态氯原子均参与了单质汞的吸附脱除反应,Hg0被Cu2+离子和共价态Cl原子氧化成了Hg2+离子,再吸附于g-C3N4表面而脱除。CO2、SO2和水蒸气对吸附剂脱汞效率影响较小,但水蒸气可提高汞吸附量。
关键词:  汞污染  燃煤烟气  石墨相氮化碳  汞吸附剂
DOI:10.12030/j.cjee.201810141
投稿时间:2018-10-23
基金项目:江苏大学高级人才基金资助项目18JDG017;国家自然科学基金重点基金资助项目21237003江苏大学高级人才基金资助项目(18JDG017);国家自然科学基金重点基金资助项目(21237003)
Removal of elemental mercury by cupric chloride-modified graphitic carbon nitride
ZHANG Zhen2,WU Jiang2
(1.School of Energy and Power Engineering, Jiangsu University, Zhenjiang 212013, China;2.College of Energy and Mechanical Engineering, Shanghai University of Electric Power, Shanghai 200090, China)
Abstract:
To control the mercury emission from the coal-fired power plants, villous graphitic carbon nitride (g-C3N4) was synthesized via direct thermal polymerization of the precursor of urea, and it was used to adsorption removal of elemental mercury (Hg0) at low temperature. The sorbents were characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD), nitrogen adsorption-desorption isotherm, and X-ray photoelectron spectroscopy (XPS) techniques. The results showed that pristine g-C3N4 performs well toward Hg0 adsorption with Hg0 removal efficiency of up to 84.7% at 120 °C. CuCl2 modification could effectively improve the Hg0 removal performance of g-C3N4, and its Hg0 removal efficiency could approach above 97% at 40~200 °C. Temperature had a slight impact on Hg0 removal efficiency. XPS analysis indicated that both copper ions and covalent chlorine atoms participated in elemental mercury adsorption removal reaction, in which Hg0 was oxidized into Hg2+ by Cu2+ ions and covalent Cl atoms, and then Hg2+ was adsorbed on g-C3N4 surface for removal. CO2, SO2 and water vapor had slight effects on Hg0 removal efficiency, whereas water vapor could improve mercury adsorption capacity.
Key words:  mercury pollution  coal-fired flue gas  graphitic carbon nitride  mercury adsorbent